AD9954 李名祺:13895723530 1 2 3 4 5 6 P1 VCC GND POWER S1 SWITCH +5V + CT1 22uF U1 LM1117-3.3V V_in V_out D N G DVDD_3.3V +5V + CT2 22uF C1 0.1uF + CT3 22uF L1 LED R1 1K U2 LM1117-1.8V V_in V_out D N G L2 10uH C2 0.1uF + CT4 22uF L3 10uH DVDD_1.8V C3 0.1uF AVDD C4 0.1uF I/O_UPDATE DVDD_1.8V DGND AVDD AGND AVDD AGND XTAL_OUT2 DVDD_3.3V AVDD C6 0.1uF R2 1K R4 1K C5 0.1uF Y1 TEST VCC GND OUT CRYSTAL/Y AVDD C18 0.1uF DVDD_1.8V C17 0.1uF RESET R5 10K AD9954 I/O UPDATE DVDD DGND AVDD AGND AVDD AGND OSC/REFCLK OSC/REFCLK CRYSTAL OUT CLKMODESELECT LOOP_FILTER D N G A D D V A D N G A I RESET PWRDWNCTL DVDD DGND AGND COMP_IN COMP_IN AVDD COMP_OUT AVDD AGND AVDD T E S R _ C A D K L C _ C N Y S N I _ C N Y S . V 3 3 _ D D V D 1 S P 0 S P K S O D N G D I O D S K L C S O D S S C 1 S P 0 S P K S O N I _ C N Y S O / I _ D D V D K L C _ C N Y S I O D S K L C S D N G D S C O D S C N Y S O D D V A D N G A D D V A D D V A T U O T U O I I P B C A D D N G A AD9954 R9 3.92K C19 0.1uF P3 RCA A V D D A G N D A G N D A V D D A G N D A V D D A V D D I I O U T O U T A G N D D A C B P D A C _ R S E T AVDD R7 50 R8 50 P2 RCA U3 C7 0.1uF C8 0.1uF C9 0.1uF C10 0.1uF C11 0.1uF C12 0.1uF C13 0.1uF C14 0.1uF C16 0.1uF AVDD DVDD_1.8V L4 10uH RESET DVDD_1.8V DGND AGND COMP_IN COMP_IN AVDD COMP_OUT AVDD AGND AVDD P17 P16 P15 P14 P13 P12 P11 P10 P35 DVDD_3.3V DGND JP1 1 3 5 7 9 11 13 15 17 19 21 2 4 6 8 10 12 14 16 18 20 22 SDO CS SCLK SDIO OSK PS0 PS1 I/O_UPDATE P37 DVDD_3.3V DGND DVDD_3.3V C15 0.1uF X1_1 X2_1 24.000MHz Y2 C21 20pF C22 20pF DVDD_3.3V U4 A to B TXD RXD DVDD_3.3V VCCA GND A VCCB DIR B SN74LVC1T45 U5 B to A VCCA GND A VCCB DIR B SN74LVC1T45 +5V +5V TXD_5V RXD_5V J1 1 2 3 SCI DVDD_3.3V S2 C20 0.1uF R6 10K RST_1 RXD TXD X2_1 X1_1 P32 P33 P34 P35 U6 RST RXD/P3.0 TXD/P3.1 XTAL2 XTAL1 P3.2/INT0 P3.3/INT1 P3.4/T0 P3.5/PWM1 GND VCC P1.7/ADC7 P1.6/ADC6 P1.5/ADC5 P1.4/ADC4 P1.3/ADC3 P1.2/ADC2 P1.1/ADC1 P1.0/ADC0 P3.7/PWM0 STC12LE5410AD(20) DVDD_3.3V C23 0.1uF P17 P16 P15 P14 P13 P12 P11 P10 P37 D C B A D C B A 1 2 3 4 Title Size B Date: File: 5 Number Revision 23-Feb-2011 E:\动手实践\模块改进（2010年6月22日）\AD9954改进版\AD9954原理图\DDS模块核心板(AD9954改进版).Ddb Sheet of Drawn By: 6